Package: libopencv-dev Version: 4.1.2+dfsg-3 Severity: serious With the last updates, opencv has lost its pkg-config file, causing FTBFS for rdeps that are looking for it, see e.g.:
https://buildd.debian.org/status/fetch.php?pkg=gst-plugins-bad1.0&arch=amd64&ver=1.16.1-1%2Bb2&stamp=1571349712&raw=0 https://buildd.debian.org/status/fetch.php?pkg=gmic&arch=amd64&ver=2.4.5-1%2Bb2&stamp=1571337762&raw=0 https://buildd.debian.org/status/fetch.php?pkg=freeture&arch=amd64&ver=1.3.0-1%2Bb2&stamp=1571337381&raw=0 Please install opencv.pc again. Emilio